fix: handle router mappings of mixed IP version #3802

Job	Run time
Build	3m 2s
Test example js-libp2p-example-browser-pubsub	1m 38s
Test example js-libp2p-example-chat	57s
Test example js-libp2p-example-circuit-relay	1m 0s
Test example js-libp2p-example-connection-encryption	53s
Test example js-libp2p-example-custom-protocols	55s
Test example js-libp2p-example-delegated-routing	1m 54s
Test example js-libp2p-example-discovery-mechanisms	1m 26s
Test example js-libp2p-example-peer-and-content-routing	1m 37s
Test example js-libp2p-example-pnet	1m 12s
Test example js-libp2p-example-protocol-and-stream-muxing	54s
Test example js-libp2p-example-pubsub	1m 0s
Test example js-libp2p-example-transports	1m 4s
Test example js-libp2p-example-webrtc-private-to-private	2m 18s
	19m 50s

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